With Camco's DIY Boat Winterizer you can quickly and efficiently winterize inboard/outboard marine engines. The Do-It-Yourself winterizer allows flushing and preparation of boat engines for winter storage with just five gallons of antifreeze (sold separately) and your flusher. You save time and money season after season. It is great for technicians too. If using a front mounted raw water pump system, use Camco's Flush Adapter (sold separately).